This apparatus is at Middlebury College. It was being sold as late as 1889 by Queen of Philadelphia for $7.00.
| Axial Telegraph: The figure "represents a
form of telegraph in which axial force is used [to print the dots and dashes
on the paper strip]. This is introduced as a new instrument, and its originality
is here claimed. Two upright coils ... are supported a short distance above
the baseboard. Entering these from above is a U-shaped rod of soft
iron, fitted to be drawn up into the coils, under the influence of the
galvanic current." from the 1851 Manual of Magnetism, pg 202; in
the appendix to the 1842 edition)
This apparatus is at Middlebury College. It was being sold as late as 1889 by Queen of Philadelphia for $7.00. |
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Telegraph, with Clock-Work. The electro-magnet and paper reel
are the same as the telegraph above, but a clockwork mechanism has been
added to draw the paper along.
The cost was $25.00 to $35.00 in the 1851 edition of the Manual of Magnetism. The instrument is in the Smithsonian Institution collection. |
| There is no maker's mark on this apparatus,
but it clearly is Davis-style apparatus. It is probably by Hall or Palmer
and Hall, Daniel Davis' successor companies.
The clock-work paper drive telegraph is at Wesleyan University in Middletown, Connecticut. |
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